The summoner name or tag is incorrect
dux #212
SILVER I
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Match History for Patch: 16.10.1
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Champion Stats for Patch: 16.10.1
Champion Mastery
lvl: 35
402,223
lvl: 28
289,715
lvl: 20
237,327
lvl: 19
193,334
lvl: 18
219,052
lvl: 15
132,027
lvl: 13
119,398
lvl: 11
95,209
lvl: 10
75,787
lvl: 9
69,938
lvl: 8
71,902
lvl: 8
57,930